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In this May 1, 2017, file photo, Serena Williams attends the Costume Institute Gala at Metropolitan Museum of Art in New York City. Williams came under fire Tuesday for claims that giving birth would make her a "real woman."

Mom-to-be Serena Williams created a stir on social media Tuesday after saying giving birth will make her a "real woman."

In a cover story for Stellar magazine, the tennis star opened up about the significance of having a baby in her life and as a woman.